<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
    <meta name="description" content="Apply simple color-to-alpha on imagery layers.">
    <meta name="cesium-sandcastle-labels" content="Beginner, Tutorials">
    <title>Cesium Demo</title>
    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script type="text/javascript" src="../../../Build/CesiumUnminified/Cesium.js" nomodule></script>
    <script type="module" src="../load-cesium-es6.js"></script>
</head>
<body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html">
<style>
    @import url(../templates/bucket.css);
    #toolbar {
        background: rgba(42, 42, 42, 0.8);
        padding: 4px;
        border-radius: 4px;
    }
</style>
<div id="cesiumContainer" class="fullSize"></div>
<div id="loadingOverlay"><h1>Loading...</h1></div>
<div id="toolbar">
    <table><tbody>
        <tr>
            <td>Threshold</td>
            <td>
                <input type="range" min="0.0" max="1.0" step="0.01" data-bind="value: threshold, valueUpdate: 'input'">
            </td>
        </tr>
    </tbody></table>
</div>
<script id="cesium_sandcastle_script">
function startup(Cesium) {
    'use strict';
//Sandcastle_Begin
var viewer = new Cesium.Viewer('cesiumContainer');

var layers = viewer.scene.imageryLayers;

// Set oceans on Bing base layer to transparent
var baseLayer = layers.get(0);
baseLayer.colorToAlpha = new Cesium.Color(0.0, 0.016, 0.059);
baseLayer.colorToAlphaThreshold = 0.2;

// Add a bump layer with adjustable threshold
var singleTileLayer = layers.addImageryProvider(new Cesium.SingleTileImageryProvider({
    url : '../images/earthbump1k.jpg',
    rectangle : Cesium.Rectangle.fromDegrees(-180.0, -90.0, 180.0, 90.0)
}));

singleTileLayer.colorToAlpha = new Cesium.Color(0.0, 0.0, 0.0, 1.0);
singleTileLayer.colorToAlphaThreshold = 0.1;

var viewModel = {
    threshold : singleTileLayer.colorToAlphaThreshold
};

Cesium.knockout.track(viewModel);

var toolbar = document.getElementById('toolbar');
Cesium.knockout.applyBindings(viewModel, toolbar);

Cesium.knockout.getObservable(viewModel, 'threshold').subscribe(
    function(newValue) {
        singleTileLayer.colorToAlphaThreshold = parseFloat(viewModel.threshold);
    }
);//Sandcastle_End
    Sandcastle.finishedLoading();
}
if (typeof Cesium !== 'undefined') {
    window.startupCalled = true;
    startup(Cesium);
}
</script>
</body>
</html>
